CN1208461A - Frost formation detector - Google Patents
Frost formation detector Download PDFInfo
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- CN1208461A CN1208461A CN96199903A CN96199903A CN1208461A CN 1208461 A CN1208461 A CN 1208461A CN 96199903 A CN96199903 A CN 96199903A CN 96199903 A CN96199903 A CN 96199903A CN 1208461 A CN1208461 A CN 1208461A
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- base station
- temperature
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- frost formation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/02—Detecting the presence of frost or condensate
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A frost deposition detector is provided which comprises: a base member 1; a heat-conductive container 4 including a frosting portion provided to the base member 1; a thermally sensitive element 6' for detecting the temperature of the base member 1; a protection pipe 8 fitted into the base member 1 and inserted into the heat-conductive container 4; a heat insulator 7 integrally formed with the protection pipe 8 to reduce heat conduction to the protection pipe 8; and another thermally sensitive element 6 fixedly inserted into the protection pipe 8. The detection sensitivity of fost deposition can be enhanced and a frost deposition detector having a high adaptability to environment, such as water resistance and moisture resistance, is provided at the same time.
Description
The present invention relates to utilize the frost formation detector of temperature sensor, in detail, be to use the frost formation detector in the defroster of evaporimeter or heat exchanger, above-mentioned evaporimeter or heat exchanger are used in the middle of various industry machines and the family expenses freezing and refrigeration cabinet.
As everyone knows, home-use freezing refrigerator etc., the evaporimeter or the fin surface frosting meeting of heat exchanger of packing into wherein reduce cooling effectiveness.If continue operation under the state of frosting, the catabiotic utilization rate of institute can significantly descend, and is not only uneconomical but also can become the reason of fault.
In the prior art, the method that addresses this is that generally is performed such, for example, in freezer, use timer, start the compressor regular hour, when reach official hour this start-up time, to heater energising the temperature of fin is risen and defrost, after defrosting ends, through the outage of certain hour heater.
This original Defrost method, the beginning of defrosting can be controlled by the time, but, the frosting state according to the switching frequency of the environment temperature of freezer, humidity, door, put into state (temperature, the evaporation capacity of storehouse article, thermal capacity etc.) and widely different, only the metering time defrosts unsatisfactory.In addition, because this Defrost method is not to survey actual frosting state, so even can take place also to defrost or crossing the situation that the frosting state does not also defrost at frosting state not, the energy efficiency of cooling operation is not necessarily high.
In order to solve the aforesaid drawbacks, develop some following frosting detection methods.
1., pass through the frosting detection method of optical instrument, this method uses photophore and light-receiving device, with the variation of reflecting surface reflection by the caused detection light quantity of skew of the incidence angle of the light of photophore irradiation, refractive index by the corresponding light that incides light-receiving device of the frosting degree of surveying this reverberation, detection and reflecting surface with light-receiving device or incident light, whether take place thereby survey frosting.
2., the frosting detection method of detected temperatures difference, this method be detect the frosting state and not in the frosting state cooler or its temperature difference on every side survey frosting and whether take place.
3., detect the frosting detection method of the variation of resonant frequency of piezoelectric vibrator, this method is to utilize the characteristic of variation of resonant frequency when in the frosting of piezoelectric vibrator surface, resonant frequency is judged to be the frosting state more than setting, thereby whether the detection frosting takes place.
4., by microcomputer-controlled frosting detection method, this method is the running cumulative time with compressor, and information such as the switching number of times of door, outer temperature degree input microcomputer calculates these data, judge having or not of frosting, survey frosting according to the frosting locator(-ter) again and whether take place.
But, in above-mentioned frosting detection method, 1. the method for optical instrument makes detection portion be difficult to miniaturization, and, in order to keep detection accuracy, the reflectivity that must keep reflecting surface is certain, in order to keep detection accuracy, must maintain termly, also have the loop to constitute the shortcoming complicated, that cost is high.
In addition, the method for temperature difference 2., the shortcoming of existence is, the error that detects frosting degree is big, can not get the accuracy of detection that needs etc., the problem in the practicality is a lot.The method of piezoelectric vibrator 3., the shortcoming of existence is, dust that adheres on the oscillator etc. and can produce misoperation from the influence of the vibration of inside and outside.Microcomputer control method 4., the shortcoming of existence is because along with the variation of season, weather, user mode, the degree of frosting is variant, because the difference of purposes energy efficiency variation sometimes.
According to above-mentioned viewpoint, the present inventor originally was willing to disclose easy maintenance and cheap frost formation detector in flat 6-223482 number (United States Patent (USP) NO.5,522,232) patent the spy, and it is conceived to the temperature difference frost formation detector and is improved.This frost formation detector is the detector of compact and low-cost, also is the good frost formation detector of the outstanding repeatability of detection accuracy simultaneously, describes with reference to Fig. 8 (a) to (c).
In the frost formation detector shown in Fig. 8 (a), on the blank part 22 of the shell 21 of thermal conductivity such as metal, form the peristome 23 of the incision-like of gas outside flowing into, heat-sensitive element 24 is set in blank part 22, draw lead 24a from shell 21.Survey the temperature that flows into the outer gas of blank parts 22 by peristome 23 with temperature-sensitive element 24, when peristome 23 because of frosting when inaccessible, the detected temperatures of temperature-sensitive element 24 changes.In the frost formation detector shown in Fig. 8 (b), the configuration section of temperature-sensitive element 24 is identical with frost formation detector shown in Fig. 8 (a) structure, and temperature-compensating is with temperature-sensitive element 24 ' be sealed in empty 20, and this cavity 20 is arranged on shell 21 bodies.Frost formation detector shown in Fig. 8 (c), on the shell 21 of thermal conductivity such as metal, be provided with 2 blank parts 22,22 ', form the peristome 23 logical therein on one of the blank part 22 with outer gas phase, in blank part 22, disposed the heat-sensitive element 24 of surveying outer temperature degree, another blank part 22 ' interior disposed the heat-sensitive element 24 that compensates usefulness '.
Frost formation detector shown in Fig. 8 (a), opening mouth in not frosting status openings portion 23, be configured in the temperature of the outer gas of temperature-sensitive element 24 detections in the blank part, when peristome 23 was sealed by frost, heat-sensitive element 24 was surveyed the temperature of the fin that frost formation detector has been installed.That is to say, because produce temperature difference, so just can survey the frosting state by surveying this temperature difference in the inaccessible front and back of peristome 23.In addition in the frost formation detector shown in Fig. 8 (b), have the temperature-sensitive element 24 of surveying outer temperature degree and the temperature that detects shell 21 be arranged on the interior temperature-sensitive element 24 of blank part 20 ', because the heat-sensitive element use of heat-sensitive element 24 ' use as temperature-compensating, compare with the frost formation detector shown in Fig. 8 (a), can more correctly survey the frosting state.
In addition, the frost formation detector shown in Fig. 8 (c), in shell 21, be provided with onesize blank part 22,22 ', in blank part, disposed respectively heat- sensitive element 24,24 '.Heat-sensitive element 24 is surveyed the temperature of outer gas by being located at peristome 23 on the blank part 22, is configured in heat-sensitive element 24 in the other blank part that does not have peristome ' be not subjected to outer gas to survey temperature on every side with influencing.This frost formation detector, when adhering to frost on the detector surface, when peristome 23 quilt frosts were inaccessible, heat-sensitive element 24 no longer was subjected to the influence of outer gas, the heat-sensitive element 24,24 ' all that is configured in two blank parts is surveyed the environment temperature of the evaporimeter that frost formation detector has been installed, so there is not temperature difference.Therefore, just can survey having or not of frosting if detect temperature in two blank parts moment (temperature difference is zero time point) when identical.This structure is because two heat-sensitive elements are arranged in two onesize blank parts, change with respect to environment temperature, the impedance of two heat-sensitive elements changes in the same manner, so compare the detection that can more correctly carry out frosting with the original example shown in Fig. 8 (a).
But there is following shortcoming in above-mentioned frost formation detector.
Frost formation detector shown in Figure 8, one side at shell 21 is provided with peristome 23, when carrying out frosting and defrosting repeatedly, the water that melts freezes again when cooling, when this action is carried out repeatedly under the state of draining completely, water possibly in the blank part 22, its result is when frosting and defrosting, just do not produce the blank part 22 of temperature-compensating side ' and the blank part 22 of detection side between temperature difference, the frost formation detector mistake is surveyed to often being in the frosting state, may lose the function of frost formation detector.
In addition, blank part 22 and blank part 22 ' in, temperature-sensitive element 24,24 ' be with the state configuration of exposing, the water droplet that has when being used to defrost can make temperature-sensitive element 24,24 ' deterioration or galvano-cautery, also can make lead 24a, 24a ' broken string, the shortcoming that exists the frost formation detector performance to reduce.
Have again, though the temperature of the shell 21 of frost formation detector has been cooled to and has installed the roughly the same temperature of temperature of the evaporimeter of detector, but when heat insulation is incomplete between the through hole of the lead 24a of the heat-sensitive element 24 in being arranged on shell 21 and the lead 24a, temperature-sensitive element 24 is subject to the Temperature Influence of shell 21, and detectivity exists further room for improvement.
The purpose of this invention is to provide a kind of frost formation detector that overcomes above-mentioned shortcoming, this frost formation detector can improve detectivity, and the resistance to water and the moisture-proof of heat-sensitive element are very good again simultaneously.
In order to achieve the above object; the frost formation detector of the invention of claim 1; it is characterized in that; this detector possess thermal conductivity base station, survey first temperature-sensitive element from the heat of above-mentioned base station, be arranged on the protection tube of white facies posterior hepatis on the above-mentioned base station, the adjacency above-mentioned white facies posterior hepatis of intercalation in above-mentioned base station, form the adiabatic body of one and be inserted and secured on second temperature-sensitive element of the surrounding space temperature of the above-mentioned white facies posterior hepatis of detection in the above-mentioned protection tube with above-mentioned protection tube.
The frost formation detector of the invention of claim 2; it is characterized in that this detector possesses the base station of thermal conductivity, first temperature-sensitive element of surveying above-mentioned base station temperature, the thermal conductivity container that contains the white facies posterior hepatis that is located on the above-mentioned base station, intercalation in above-mentioned base station and be configured in the protection tube of the blank part in the above-mentioned thermal conductivity container, form the adiabatic body of one with above-mentioned protection tube and be inserted and secured on second temperature-sensitive element of the environment temperature of the above-mentioned blank part of detection in the above-mentioned protection tube.
The frost formation detector of the invention of claim 3; it is characterized in that; this detector possess thermal conductivity base station, have the thermal conductivity container of the white facies posterior hepatis that is located on the above-mentioned base station, a blank part in the above-mentioned thermal conductivity container, in abutting connection with another blank part of above-mentioned thermal conductivity container setting, insert protection tube in above-mentioned each blank part, form the adiabatic body of one and insert the temperature-sensitive element that is fixed in the above-mentioned protection tube respectively with above-mentioned protection tube.
The frost formation detector of the invention of claim 4; it is characterized in that, this detector possess thermal conductivity base station, have the white facies posterior hepatis that is located on the above-mentioned base station the first thermal conductivity container, be located at the second thermal conductivity container on the above-mentioned base station, respectively be configured in protection tube in the blank part in the above-mentioned first and second thermal conductivity containers, form the disconnected hot body portion of one and insert the temperature-sensitive element that is fixed in the above-mentioned protection tube respectively with above-mentioned protection tube.
The frost formation detector of the invention of claim 5; it is characterized in that; this detector possesses the base station of thermal conductivity; be located at the white facies posterior hepatis that constitutes by column at least on the above-mentioned base station, be located at thermal conductivity container on the above-mentioned base station, with above-mentioned white facies posterior hepatis in abutting connection with the protection tube that is provided with, be fixed on the protection tube in the blank part in the above-mentioned thermal conductivity container, form the adiabatic body of one with above-mentioned protection tube and be inserted and secured on temperature-sensitive element in the above-mentioned protection tube respectively.
The frost formation detector of the invention of claim 6, be on the basis of each described frost formation detector in claim 1 to 5, it is characterized in that above-mentioned base station, above-mentioned white facies posterior hepatis or the above-mentioned thermal conductivity container with above-mentioned white facies posterior hepatis are to be made of aluminium, copper, iron, nickel, titanium, zinc or their alloy.
The frost formation detector of the invention of claim 7 is on each described frost formation detector basis, to it is characterized in that in claim 1 to 6, and above-mentioned adiabatic body and above-mentioned protection tube are that split constitutes.
The frost formation detector of the invention of claim 8 is on each described frost formation detector basis, to it is characterized in that in claim 1 to 7, and above-mentioned at least white facies posterior hepatis applies with water repellency or hydrophilic material.
The frost formation detector of the invention of claim 9 is on each described frost formation detector basis, to it is characterized in that above-mentioned base station has the contact site that contacts with the pipe of evaporimeter in claim 1 to 8.
The frost formation detector of the invention of claim 10 on each described frost formation detector basis, is characterized in that having the shape on curved surface or inclined plane with the corresponding side of contact site that is formed on the above-mentioned base station in claim 1 to 9.
Fig. 1 is the figure of an embodiment of expression frost formation detector of the present invention, (a) is oblique view, (b) is the profile along (a) X-Y line.
Fig. 2 is the figure of another embodiment of expression frost formation detector of the present invention, (a) is oblique view, (b) is the profile along (a) X-Y line.
Fig. 3 is the figure of another embodiment of expression frost formation detector of the present invention, (a) is oblique view, (b) is the profile along (a) X-Y line.
Fig. 4 is the figure of the detection characteristic of expression the present invention and existing frost formation detector.
Fig. 5 is the figure of another embodiment of expression frost formation detector of the present invention.
Fig. 6 (a) and (b) are figure of another embodiment of expression frost formation detector of the present invention.
Fig. 7 is the figure of the another kind of embodiment of expression frost formation detector of the present invention.
Fig. 8 is the figure of the existing frost formation detector of expression.
Below, with reference to the description of drawings embodiments of the invention.
Fig. 1 (a) and (b) are oblique views and the profile of expression along the X-Y line direction of arrow of (a) of an embodiment of frost formation detector of the present invention.1 is the base station of the thermal conductivity that is made of metal materials such as aluminium, copper, iron, nickel, titaniums in figure.The contact site 3 of the curved surface shaped that the pipe 2 of formation evaporimeter is contacted on base station 1.The 4th, have the thermal conductivity container of white facies posterior hepatis 9, on container 4, form the peristome of incision-like, outer gas flows to the blank part 5 of container 4 by peristome.In this blank part 5, protection tube 8 is set, in protection tube 8, is fixing the temperature-sensitive element 6 of surveying environment temperature with bonding agent or resin 11 etc.For make accommodate temperature-sensitive element 6 protection tube 8 with base station 1 thermal insulation, be provided with the adiabatic body 7 that is made of one with protection tube 8,7 intercalations of disconnected hot body portion are in base station 1 and be fixed.Be formed with concavity space 7a in disconnected hot body portion 7, the air layer that is formed by this concavity space makes base station 1 and protection tube 8 heat insulations.In order correctly to detect the variations in temperature of base station 1, on base station, be provided with empty 1a, in the 1a of this cavity, inserted with temperature-sensitive element 6 with the temperature-sensitive elements such as thermistor 6 of characteristic ', with sealing and fixing such as bonding agent or resins 11.6a, 6a ' are the leads that has covered insulating barrier.Because temperature-sensitive element 6 and 6 ' and insert in the protection tube 8 respectively and fix in the empty 1a and with resin 11 etc., thus resistance to water and moisture-proof improved.
The action of the frost formation detector of the foregoing description is described below with reference to Fig. 1.Frost formation detector with figure is installed into the contact site 3 of base station 1 and the pipe 2 tight contacting structure of evaporimeter, and this evaporimeter is arranged in the freezer.For example, the environment temperature in the groove of freezer remains on 10 ℃, and the surface temperature of cooling pipe 2 is set at-20 ℃.At first, because frost formation detector is a frosting state not, because in the outside of the container of frost formation detector 4 and the blank part 5 is open state, so the temperature-sensitive element 6 in the blank part 5 is subjected to the Temperature Influence of outer gas, the temperature that detects is than evaporator surface temperature height, base station 1 owing to frost formation detector contacts closely with cooling pipe 2 on the other hand, and makes the temperature-sensitive element 6 ' cooling of sealing and fixing in base station 1, can roughly detect the temperature of evaporimeter.Thereby, produced temperature difference by the temperature of heat-sensitive element 6,6 ' detect.
Process along with the time, frosting on the surface of the white facies posterior hepatis 9 of the container 4 of frost formation detector, through after a while, frost attached to the surface of white facies posterior hepatis 9 is being grown up, in the blank part 5 of container 4, the circulation of outer air degenerates, and the surface of final container 4 is covered by frost, thus in the blank part 5 with outer air bound from.Its result, the temperature in the blank part 5 and the temperature of evaporimeter are about equally.Therefore can be according to being undertaken and the corresponding defrosting of frosting degree by the temperature difference of heat-sensitive element 6,6 ' detected.
Below with reference to Fig. 2, the other frost formation detector with embodiments of the invention is described.Fig. 2 (a) (b) is its oblique view and along the profile of the direction of arrow of the X-Y line of (a).With the temperature-sensitive element 6 of the frost formation detector of figure ' arrangement and the heat-sensitive element of surveying at base station 1 enterprising trip temperature 6 shown in Figure 1 ' arrangement different.
The frost formation detector of Fig. 2 on base station 1, forming the container 4,4 of thermal conductivity ', on base station 1, forming and contact sites 3 that cooling pipe 2 contacts closely.On base station 1, forming container 4 and container 4 ', said vesse 4 forms white facies posterior hepatis 9, said vesse 4 ' have blank part 4a.There is outer air communication the inside of container 4, container 4 ' on be provided with the peristome that forms gas outside the circulation.Inserting protection tube 8 in the blank part 5 of container 4, container 4 ' blank part 4a in intercalation protection tube 8 ', fixing the heat-sensitive element 6 of surveying environment temperature with bonding agent or resin 11 in protection tube 8 inside.Inserting in protection tube 8 ' inside with heat-sensitive element 6 with the temperature-sensitive elements such as thermistor 6 of characteristic ', and with sealing and fixing such as bonding agent or resins 11.The protection tube 8 of taking in temperature-sensitive element 6 arrives in the base station 1 above-mentioned adiabatic body 7 and base station 1 thermal insulation with adiabatic body 7 formation one and intercalation.Concavity space 7a makes base station 1 and protection tube 8 thermal insulation by air layer.6a, 6a ' are the leads that is insulated coating.
So, in Fig. 1, because temperature-sensitive element 6 ' being fixed in the blank part, blank part is located on the base station.So resistance to water, the reliability of moisture-proof etc. is insufficient, and in Fig. 2, be configured in respectively container 4,4 ' blank part 5, heat-sensitive element 6, the 6 ' insertion in the 4a be fixed on protection tube 8,8 with adiabatic body 7 ' in.Because such structure, the reliability of resistance to water, moisture-proof etc. improves.In addition, if in advance temperature-sensitive element 6,6 ' insertion be fixed on protection tube 8,8 ' in, under the state of temperature-sensitive element 6,6 ' be fixed on protection tube 8,8 ' interior, container 4,4 ' interior just the becoming that is assembled on the base station is easy to.Again because corresponding to the detected object of freezer etc. can carry out heat-sensitive element 6,6 ' mensuration select, so can make the good and good structure of operation with respect to the reliability of environment for use.Its advantage is to omit the final mensuration of product export inspection etc.
But, in the frost formation detector of Fig. 1, what be configured in that heat-sensitive elements 6 in the container 4 survey is the temperature of the air of component periphery, relative therewith, be arranged on the heat-sensitive element 6 ' direct detection base station 1 in the base station 1, promptly cool off the temperature of pipe 2, thus detect the loop in fact for temperature difference, may exist owing to heat-sensitive element 6,6 ' the difference of the thermo-responsive that produces of the difference of thermal capacity become detecting error.In the frost formation detector of Fig. 2, the temperature-sensitive element 6 that temperature-compensating is used ' be configured on the position of leaving base station 1, though how much improved detecting error, the difference of thermo-responsive still exists.Embodiment with reference to Fig. 3 illustrates a kind of by the temperature-sensitive element of white detection side and temperature-compensating side is partly made identical construction, make it to have identical thermal capacity, the difference of no thermo-responsive is also more correctly surveyed the frosting sniffer of frosting state according to peripheral situation.
Fig. 3 (a) (b) is other the figure of embodiment of expression frost formation detector of the present invention.Fig. 3 (a) is its oblique view, and Fig. 3 (b) is the profile of cutting open along the direction of arrow of the X-Y line of (a) that portions cut is arranged.Fig. 3 (b) expression frost formation detector is installed in the state on the cooling tube.
In Fig. 3, on the base station 1 of thermal conductivity, form the contact site 3 that can closely contact and be fixed on the cooling tube 2.On base station 1, also forming the container 4,4 of thermal conductivity '.On container 4, form white facies posterior hepatis 9, in the blank part 5 of container 4, be provided with temperature-sensitive element 6.On container 4, form the peristome of incision-like, gas outside circulate to blank part 5 in from the peristome of incision-like, chimeric adiabatic body 7 on base station 1 in the protection tube 8 of setting, is being fixed temperature-sensitive element 6 by bonding agent or resin 11 etc. at the adiabatic body 7 of perforation.Protection tube 8 be by adiabatic body 7 with base station 1 thermal insulation structure.On the other hand, have blank part 5 ' container 4 ' in be provided with the heat-sensitive element 6 that is used to survey environment temperature ', disposed heat-sensitive element 6 ' protection tube 8 ' be by disconnected hot body portion 7 with base station 1 thermal insulation structure.Be cooled owing to base station 1 and cooling tube 2 closely contact, it roughly is the temperature of evaporimeter that blank part 5 ' interior and outer gas interdict that its temperature is defined as.Connect adiabatic body 7,7 ' protection tube 8,8 ' intercalation on base station 1; be configured in the temperature of the temperature-sensitive element 6 ' detection evaporimeter periphery of container 4 ' interior, temperature-sensitive element 6 is surveyed outer temperature degree, temperature-sensitive element 6,6 ' and be temperature-sensitive element with characteristic; for example, adopt element such as thermistor.In addition, for make container 4,4 ' thermal capacity equate, preferably adopt same material.
Below, describe with regard to the action of the frost formation detector of the foregoing description.
As explained above, temperature remains on about 10 ℃ in the groove of refrigerator, the surface temperature of cooling tube, for example be defined as-20 ℃, initial because frost formation detector is a frosting state not, and blank part 5 inside of the container 4 of frost formation detector are in open state because of the peristome of incision-like, thereby logical with outer gas phase, so the temperature-sensitive element 6 in the blank part 5 is subjected to outer gas Temperature Influence, the temperature that detects is higher than evaporator surface temperature.On the other hand because base station 1 is fixed on the cooling tube 2 and is cooled, so sealing and fixing container 4 ' the temperature-sensitive element 6 ' detect of blank part 5 ' interior roughly be the temperature of evaporimeter.Therefore, produced temperature difference between the temperature by heat-sensitive element 6,6 ' detect respectively.
Along with the process of time, the surperficial frosting of the white facies posterior hepatis 9 of the container 4 of frost formation detector, along with the growth of the lip-deep frost that is attached to white facies posterior hepatis 9 little by little with the circulation variation of outer gas, the surface of final container 4 is covered by frost.With outer gas blocking, the temperature in the blank part 5 of container 4 roughly equates with the temperature of evaporimeter in the blank part 5.Therefore, according to by the blank part 5 of heat-sensitive element 6,6 ' determine and blank part 5 ' temperature difference just can detect the frosting state.
Below just the detection feature of the frost formation detector of Fig. 4 describe.
Fig. 4 is the detection feature figure of the frost formation detector of comparison present embodiment (Fig. 3) and prior art example (Fig. 8), is the experimental result of gap (kerf width) when being set at 5mm at the white facies posterior hepatis of the frost formation detector of present embodiment and prior art example.This experimental result is represented, frost formation detector of the present invention produces about 10 ℃ temperature difference at frosting state not, and is relative therewith, and the frost formation detector of original embodiment produces about 5 ℃ temperature difference at frosting state not.
As indicated in Fig. 4, even adhere to frost on the white facies posterior hepatis 9 during beginning, so, keep 10 ℃ temperature difference because variation does not appear in the difference that does not hinder in the blank part 5 circulations with outer gas to be arranged on each atmospheric temperature of the heat- sensitive element 6,6 of blank part 5,5 ' interior ' detected.Yet along with the process of time, the frost on white facies posterior hepatis 9 surfaces is grown up, and blank part 5 reduces with the aperture area of outer gas, and the circulation of outer gas also reduces gradually, and thus, blank part 5 and 5 ' interior temperature difference diminishes gradually.The adhesion amount of frost further increases, the peristome of incision-like is closed, blank part 5 and outer gas blocking, the temperature in the blank part 5 equal the temperature (being substantially equal to the temperature of base station 1) of evaporimeter, are roughly zero by container 4, the 4 ' interior temperature difference of heat-sensitive element 6,6 ' detect.
The temperature difference of the initial value of the frost formation detector of present embodiment and prior art example causes that by the temperature-sensitive element 6 and the structure of the thermal insulation between the base station that are located in the present embodiment promptly the difference of being constructed by the thermal insulation of adiabatic body 7 and concavity space 7a produces.
In the embodiments of figure 3, just can detect the generation of frost and the adhesion amount (frosting degree) of frost if detect blank part 5 and 5 ' interior temperature difference.As indicated in Fig. 4 with the structure of the frost formation detector of prior art relatively, temperature difference is big in the present embodiment, detectivity is good.Though the growth of the frost that white facies posterior hepatis is 9 is grown up from both sides between white facies posterior hepatis, but in Fig. 4,, be set at from one-sided growth for easy understanding, be that 5mm is made at the interval of the otch of the white facies posterior hepatis of transverse axis, set that frost only represents from one-sided growth.
In the above-described embodiments, the container 4 of the base station 1 of thermal conductivity and thermal conductivity uses aluminium, copper, iron, nickel, titanium, zinc etc. or uses their alloy.Perhaps use aluminium nitride, a kind of or aluminium nitride of carborundum, the combination of carborundum are also passable.
Much less, material regardless of base station 1 and container 4, with zinc, silicon or the good ceramic material of thermal conductivity such as aluminium nitride, carborundum, the resin material of epoxy resin-impregnated or the material that constitutes with these thermal conductivity excellent material can on carbon fibre.
In the present embodiment, in the accompanying drawings, base station 1 and container 4 and/or container 4 ' be shown one, yet, base station 1 and container 4 and/or container 4 ' also can constitute respectively.Base station 1 and container 4 and/or container 4 ' for example adopting, prior aries such as casting die, cutting method, casting method are shaped.
In the present embodiment, make not water structure in the container 4 in order to form, by the boundary section opening with base station 1 and container 4, during defrosting, the water of thawing can be discharged to the outside of container 4 along the surface of base station 1.
In the present embodiment, be illustrated at the situation of using thermistor as heat-sensitive element, but be not limited only to thermistor.
In the present embodiment,, be not limited to this structure,, for example can be installed on the cold sink so long as it is just passable to survey the structure of temperature of evaporimeter though represented to be installed in structure on the cooling tube.
In the frost formation detector of the foregoing description, be provided with the temperature-sensitive element that temperature-compensating is used, be subjected to the running of evaporimeter, the alternately influence that stops and the influences such as external disturbance of ambient air, the change of evaporator surface temperature, by being arranged on the go forward side by side trip temperature compensation of blank part 5 ' interior temperature-sensitive element 6 ' this surface temperature of detection, thereby can correctly survey frosting state (frosting degree).
In the embodiment of Fig. 1 and even Fig. 3; Fig. 1, Fig. 2 represent the situation of adiabatic body 7 and protection tube 8,8 ' be made of one; Fig. 3 represents the situation that split ground constitutes; even in the embodiment of Fig. 1, Fig. 2; consider from aspects such as assembling operation and heat reactivities, also can split ground form disconnected hot body portion 7 and protection tube 8 or 8 '.
Below, describe with regard to other embodiments of the invention with reference to Fig. 5.
In the frost formation detector of Fig. 3, form the white facies posterior hepatis of incision-like, and in Fig. 5, be the structure that forms container 4 parts with the white facies posterior hepatis 10 of column.The temperature-sensitive element 6 that is disposed receives in the protection tube 8 that is in central authorities that the white facies posterior hepatis 10 with several columns fences up, because other structure is identical with the embodiment of Fig. 3, so the explanation of other structure has just been omitted.
In the frost formation detector of Fig. 5 because frost is attached to the surface of white facies posterior hepatis 10 and grow up, the inside that fences up with white facies posterior hepatis 10 hindered with the circulation of outer gas, finally and outer gas interdict.Its result, the temperature-sensitive element 6 of temperature-compensating side ' disappear with the temperature difference of heat-sensitive element 6, thus just can carry out white detection.
In order to adjust white adhesion amount, can increase and decrease the quantity of the white facies posterior hepatis 10 of column, perhaps regulate the interval between the white facies posterior hepatis 10.And though do not show among the figure, the also available white attachment from a dendritic extension of column of white facies posterior hepatis 10 surrounds the such structure of protection tube 8.Can also by white facies posterior hepatis 10 and protection tube 8 in abutting connection with and be that the white facies posterior hepatis 10 of a column constitutes.
In the various embodiments described above; constitute the adiabatic body 7 of temperature detection portion and protection tube 8 and be preferably formed as so disconnected thermotectonics, promptly; to do longly to the distance of base station 1 from the sensible heat portion top ends that is arranged on the heat-sensitive element 6 in the protection tube as much as possible, to prevent being delivered to temperature-sensitive element from the heat of base station 1 part.An example as the embodiment that has improved adiabatic structure energetically, shown in Fig. 6 (a), connect on the lead 6a of heat-sensitive element 6 than the material of lead 6a poor thermal conductivity iron for example, the lead 6b of nickel etc. can reduce the influence of the heat of transmitting lead 6a thus.This embodiment also is applicable to the foregoing description.
In the embodiment of Fig. 1, Fig. 2 or Fig. 6 (a), also can make shown in Fig. 6 (b) like that protection tube 8 intercalations in disconnected hot body portion 7 ' interior shape.
In the various embodiments described above, constitute as long as only the top ends of protection tube 8 is waited with the good metal of thermal conductivity, can make the better frost formation detector of response so just can promptly detect environment temperature.
In container and white facies posterior hepatis adhere to the water droplet that the water in when defrosting becomes easily, can freeze again when cooling off again, block peristome, can not correctly survey frosting.For solve such problem, in the various embodiments described above, by including on the white facies posterior hepatis of container with water proofing property or hydrophilic material coatings such as polytetrafluoroethylene (PTFE), silicon or nylon, water can not remain on the white facies posterior hepatis with the water droplet state, just can correctly survey the frosting situation.
For example, the part of coating above-mentioned material can be the surface of the inner face and the protection tube of white facies posterior hepatis, also can be the surface that comprehensively reaches protection tube of white facies posterior hepatis.
In the various embodiments described above, be arranged on the contact site 3 that contacts with cooling tube 2 on the base station 1, be formed on the two sides of base station 1, and the structure that all contacts with cooling tube of both sides.Yet, as shown in Figure 7, also can think and the only one-sided structure that is provided with contact site 3 of cooling tube contact portion.With the contact site 3 corresponding another sides that are formed on the base station 1 on form semicylindrical curved surface 12.The water that melts during defrosting flows down along these semicylindrical curved surface 12 inclined-planes.Therefore, because can resident water on base station 1, just can eliminate by freezing again and wait the misoperation of generation.The shape of above-mentioned curved surface 12 is not limited to semicylindrical curved surface, so long as the inclined surface that has under the current of the thawing of making is just passable.
Shown in Figure 7 prevent the structure that freezes again under the current that curved surface 12 makes thawing being provided with on the base station 1, also can be applicable to the frost formation detector of Fig. 1, Fig. 3, Fig. 5, Fig. 6 certainly.
As mentioned above; frost formation detector of the present invention has following structure: dispose temperature-sensitive element that covers with protection tube and the temperature-sensitive element of surveying the base station temperature in having the thermal conductive container of white facies posterior hepatis; with making the protection tube heat insulation with the heat-insulating adiabatic body of base station; the heat-sensitive element that in having the thermal conductivity container of white facies posterior hepatis, disposes, the temperature of detection ambient atmosphere.When white facies posterior hepatis frosting, the circulation of air in the container is hindered and temperature changes, according to the temperature difference of it and base station temperature, can survey the frosting state.
In the other frost formation detector of the present invention, by being configured in thermo-responsive detection in the white facies posterior hepatis that contains column by frosting state not with owing to frosting makes the inaccessible outer gas variation of temperature that produces of white facies posterior hepatis, survey evaporimeter atmospheric temperature on every side by the temperature-sensitive element in the blank part that is configured in another inaccessible container, just can detect the frosting state by the temperature difference of surveying both.
Frost formation detector of the present invention becomes the capacity shape about equally in the blank part of the container that makes white detection side and temperature-compensating side, so owing to contain that both thermal capacity of temperature detection portion is identical can more correctly survey the frosting state.
As described above; frost formation detector of the present invention is compared with existing frost formation detector; because can prevent to conduct heat to the heat-sensitive element that is arranged in the container from the base station of the thermal conductivity that constitutes frost formation detector by the heat insulation structure that constitutes by disconnected hot body portion and protection tube, thus by temperature-sensitive element can detect the temperature of correct ambient atmosphere, white detectivity increases substantially.In addition, because its simple structure so manufacture easily, is safeguarded and is detected simply.The while low cost of manufacture.If use frost formation detector of the present invention,,, so just can carry out the good cooling operation of energy efficiency so can only just can defrost where necessary because can correctly control beginning, the end of a period of defrosting.
Have, frost formation detector of the present invention is the part supporting thermal conductivity container with base station again, and the shipwreck when being defrosting is to remain in the structure in the container with white facies posterior hepatis, and the residual water in the time of needn't worrying to cool off again freezes to cause misoperation.
In addition; heat-sensitive element is inserted and secured in the protection tube with disconnected hot body portion, because base station and temperature-sensitive element heat insulation can prevent from the heat conduction of base station to heat-sensitive element; so compare with existing frost formation detector, white detectivity is improved significantly.
Have again, because heat-sensitive element is housed in the protection tube, so improved with respect to the reliability of the environment of resistance to water and moisture-proof etc.
Claims (10)
1. frost formation detector; it is characterized in that; this detector possess thermal conductivity base station, survey first temperature-sensitive element from the heat of above-mentioned base station, be arranged on protection tube that white facies posterior hepatis on the above-mentioned base station, intercalation dispose contiguously, and the disconnected hot body portion that forms as one of above-mentioned protection tube, second temperature-sensitive element of temperature of surrounding space that is inserted and secured on the above-mentioned white facies posterior hepatis of detection in the above-mentioned protection tube on above-mentioned base station and with above-mentioned white facies posterior hepatis.
2. frost formation detector; it is characterized in that; this detector possesses the base station of thermal conductivity; survey first heat-sensitive element of base station temperature; thermal conductivity container, intercalation with the white facies posterior hepatis that is located on the above-mentioned base station is on above-mentioned base station and be configured in the protection tube of the blank part in the above-mentioned thermal conductivity container, forms the adiabatic body of one with above-mentioned protection tube and is inserted and secured on second heat-sensitive element of the environment temperature of the above-mentioned blank part of detection in the above-mentioned protection tube.
3. frost formation detector; it is characterized in that; this detector possesses a blank part in the base station of thermal conductivity, the thermal conductivity container with the white facies posterior hepatis that is located on the above-mentioned base station, the above-mentioned thermal conductivity container, another blank part of contiguous above-mentioned thermal conductivity container setting; insert the protection tube in above-mentioned each blank part, form the adiabatic body of one with above-mentioned protection tube and be inserted and secured on temperature-sensitive element in the above-mentioned protection tube respectively.
4. frost formation detector; it is characterized in that; this frost formation detector possesses the base station of thermal conductivity; has the first thermal conductivity container that is located at white facies posterior hepatis on the above-mentioned base station; be located at the second thermal conductivity container on the above-mentioned base station; be configured in the protection tube of the blank part in the above-mentioned first and second thermal conductivity containers respectively, form the adiabatic body of one with above-mentioned protection tube and be inserted and secured on temperature-sensitive element in the above-mentioned protection tube respectively.
5. frost formation detector; it is characterized in that; this detector possesses the base station of thermal conductivity; be located at the white facies posterior hepatis that constitutes by column at least on the above-mentioned base station; be located at the thermal conductivity container on the above-mentioned base station; with the protection tube of above-mentioned white facies posterior hepatis in abutting connection with setting, the protection tube and the above-mentioned protection tube that are fixed in the blank part in the above-mentioned thermal conductivity container form the adiabatic body of one and are inserted and secured on the interior temperature-sensitive element of above-mentioned protection tube respectively.
6. each described frost formation detector in the claim 1 to 5 is characterized in that, above-mentioned base station, and above-mentioned white facies posterior hepatis or the above-mentioned thermal conductivity container that contains above-mentioned white facies posterior hepatis are to be made of aluminium, copper, iron, nickel, titanium, zinc or their alloy.
7. its above-mentioned disconnected hot body portion of each described frost formation detector and above-mentioned protection tube split constitute in the claim 1 to 6.
8. each described frost formation detector in the claim 1 to 7 is characterized in that, above-mentioned at least white facies posterior hepatis applies with water repellency or hydrophilic material.
9. each described frost formation detector in the claim 1 to 8 is characterized in that above-mentioned base station has the contact site that contacts with the pipe of evaporimeter.
10. each described frost formation detector in the claim 1 to 9 is characterized in that, has the shape on curved surface or inclined plane with the corresponding side of contact site that is formed on the above-mentioned base station.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010796 | 1996-02-06 | ||
| JP20107/1996 | 1996-02-06 | ||
| JP20107/96 | 1996-02-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1208461A true CN1208461A (en) | 1999-02-17 |
| CN1116572C CN1116572C (en) | 2003-07-30 |
Family
ID=12017901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96199903A Expired - Fee Related CN1116572C (en) | 1996-02-06 | 1996-08-30 | Frost formation detector |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6092925A (en) |
| EP (1) | EP0881442B1 (en) |
| KR (1) | KR19990082279A (en) |
| CN (1) | CN1116572C (en) |
| DE (1) | DE69622199D1 (en) |
| WO (1) | WO1997029332A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107367529A (en) * | 2017-08-15 | 2017-11-21 | 芯海科技（深圳）股份有限公司 | Coagulate white sensor and with the evaporator for coagulating white detection function |
| CN107543352A (en) * | 2017-09-11 | 2018-01-05 | 芜湖凡达机械科技有限公司 | A kind of refrigerator |
| WO2021037253A1 (en) * | 2019-08-29 | 2021-03-04 | 杭州三花研究院有限公司 | Sensor and heat exchanger |
| CN114704994A (en) * | 2018-03-08 | 2022-07-05 | Lg电子株式会社 | Refrigerator with a door |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69622199D1 (en) * | 1996-02-06 | 2002-08-08 | Ishizuka Electronics Corp | DEVICE FOR DETECTING ICE FORMATION |
| JP3460552B2 (en) * | 1997-11-28 | 2003-10-27 | 松下電器産業株式会社 | Air conditioner temperature sensor fixing device |
| KR100547421B1 (en) * | 1998-09-04 | 2006-04-12 | 주식회사 엘지이아이 | Freezing detector of the refrigerator |
| US6467282B1 (en) | 2000-09-27 | 2002-10-22 | Patrick D. French | Frost sensor for use in defrost controls for refrigeration |
| DE10315524A1 (en) * | 2003-04-04 | 2004-10-14 | BSH Bosch und Siemens Hausgeräte GmbH | Refrigeration device and operating method therefor |
| US20080223052A1 (en) * | 2007-03-14 | 2008-09-18 | Ronald Ravi Khosla | Retrofittable air conditioner to refrigeration conversion unit |
| US9062906B2 (en) * | 2007-03-14 | 2015-06-23 | Store It Cold, Llc | Retrofittable air conditioner to refrigeration conversion unit |
| JP4837777B2 (en) | 2007-04-04 | 2011-12-14 | エスペック株式会社 | Hygrometer and dew point meter |
| KR20100058813A (en) * | 2008-11-25 | 2010-06-04 | 삼성전자주식회사 | Cooling system and method for controlling the same |
| DE102010042531A1 (en) * | 2010-10-15 | 2012-04-19 | BSH Bosch und Siemens Hausgeräte GmbH | Refrigerating appliance with a holder for a functional component |
| WO2016141477A1 (en) * | 2015-03-12 | 2016-09-15 | Universite Laval | System and method for determining an icing condition status of an environment |
| US10753665B2 (en) * | 2017-08-31 | 2020-08-25 | Nidec Sankyo Corporation | Ice making device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3383877A (en) * | 1966-05-10 | 1968-05-21 | Ranco Inc | Defrost control means for refrigerating systems |
| JPS531631Y2 (en) * | 1975-03-24 | 1978-01-18 | ||
| US4163327A (en) * | 1977-11-04 | 1979-08-07 | Fts Systems, Inc. | Direct condenser defrosting system |
| DE3001019A1 (en) * | 1980-01-12 | 1981-07-23 | Danfoss A/S, 6430 Nordborg | DEFROSTING DEVICE FOR THE EVAPORATOR OF A REFRIGERATION SYSTEM |
| AT390512B (en) * | 1986-10-14 | 1990-05-25 | Sitte Hellmuth | REFRIGERATION CHAMBER FOR MAKING THIN CUTS AT A REDUCED TEMPERATURE |
| US5052190A (en) * | 1988-08-04 | 1991-10-01 | Super S.E.E.R. Systems Inc. | Apparatus for the sensing of refrigerant temperatures and the control of refrigerant loading |
| US5313787A (en) * | 1990-10-01 | 1994-05-24 | General Cryogenics Incorporated | Refrigeration trailer |
| US5345775A (en) * | 1993-03-03 | 1994-09-13 | Ridenour Ralph Gaylord | Refrigeration system detection assembly |
| US5707151A (en) * | 1994-01-13 | 1998-01-13 | Ranco Incorporated Of Delaware | Temperature transducer assembly |
| JPH0886557A (en) * | 1994-09-19 | 1996-04-02 | Ishizuka Denshi Kk | Frost detector |
| DE69622199D1 (en) * | 1996-02-06 | 2002-08-08 | Ishizuka Electronics Corp | DEVICE FOR DETECTING ICE FORMATION |
-
1996
- 1996-08-30 DE DE69622199T patent/DE69622199D1/en not_active Expired - Lifetime
- 1996-08-30 US US09/117,777 patent/US6092925A/en not_active Expired - Fee Related
- 1996-08-30 CN CN96199903A patent/CN1116572C/en not_active Expired - Fee Related
- 1996-08-30 EP EP96928715A patent/EP0881442B1/en not_active Expired - Lifetime
- 1996-08-30 KR KR1019980706008A patent/KR19990082279A/en not_active Application Discontinuation
- 1996-08-30 WO PCT/JP1996/002451 patent/WO1997029332A1/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107367529A (en) * | 2017-08-15 | 2017-11-21 | 芯海科技（深圳）股份有限公司 | Coagulate white sensor and with the evaporator for coagulating white detection function |
| CN107367529B (en) * | 2017-08-15 | 2020-11-24 | 芯海科技（深圳）股份有限公司 | Frost sensor and evaporator with frost detection function |
| CN107543352A (en) * | 2017-09-11 | 2018-01-05 | 芜湖凡达机械科技有限公司 | A kind of refrigerator |
| CN114704994A (en) * | 2018-03-08 | 2022-07-05 | Lg电子株式会社 | Refrigerator with a door |
| CN114704994B (en) * | 2018-03-08 | 2023-12-29 | Lg电子株式会社 | Refrigerator with a refrigerator body |
| WO2021037253A1 (en) * | 2019-08-29 | 2021-03-04 | 杭州三花研究院有限公司 | Sensor and heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69622199D1 (en) | 2002-08-08 |
| WO1997029332A1 (en) | 1997-08-14 |
| EP0881442A1 (en) | 1998-12-02 |
| KR19990082279A (en) | 1999-11-25 |
| EP0881442A4 (en) | 1998-12-02 |
| US6092925A (en) | 2000-07-25 |
| CN1116572C (en) | 2003-07-30 |
| EP0881442B1 (en) | 2002-07-03 |
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